/* ==========================================================================
   Morse: a telegraph desk. Bottle-green enamel, a running paper tape inked
   in violet, a brass key on an oak base, one amber lamp.
   ========================================================================== */

:root {
  --desk: #0f3b2e;
  --desk-2: #0b2e24;
  --desk-3: #164a3a;
  --line: #2b5c4b;
  --text: #ece6d3;
  --text-2: #a9c2b4;        /* 6.1:1 on desk */
  --paper: #ece6d3;
  --ink: #4b1f7a;
  --brass: #c9a13b;
  --lamp: #ffb347;
  --display: "Anybody", system-ui, sans-serif;
  --type: "Courier Prime", ui-monospace, monospace;
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scrollbar-color: var(--line) var(--desk); }
body {
  margin: 0; min-height: 100vh;
  background:
    radial-gradient(120% 70% at 50% 0%, var(--desk-3), transparent 60%) no-repeat,
    var(--desk);
  color: var(--text);
  font: 400 1rem/1.55 var(--display);
  font-variation-settings: "wdth" 100;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--brass); color: var(--desk-2); }
h1, h2, p { margin: 0; }
:focus-visible { outline: 2px solid var(--lamp); outline-offset: 4px; border-radius: 6px; }

.top, .telegram, .desk, .chart, .foot { width: min(100% - 2rem, 72rem); margin-inline: auto; }
.top { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .5rem 2rem; padding-top: clamp(1.25rem, 4vw, 2.5rem); }
.top h1 { font-size: clamp(2.6rem, 8vw, 5rem); font-weight: 900; font-variation-settings: "wdth" 150; letter-spacing: -.02em; line-height: .9; }
.top p { color: var(--text-2); max-width: 36ch; }

/* ---------- Tape ---------- */
.tape-wrap { position: relative; margin-top: clamp(1.5rem, 4vw, 2.5rem); }
#tape { display: block; width: 100%; height: clamp(8rem, 18vw, 12rem); }
.lamp {
  position: absolute; right: clamp(1rem, 4vw, 3rem); top: .4rem;
  width: 1.3rem; height: 1.3rem; border-radius: 50%;
  background: radial-gradient(circle at 40% 35%, #6a4a1a, #2a1d08);
  box-shadow: inset 0 0 0 2px #1b1407;
  transition: background .04s, box-shadow .04s;
}
.lamp.on { background: radial-gradient(circle at 40% 35%, #fff2c8, var(--lamp) 55%, #c86b00); box-shadow: 0 0 22px 6px rgb(255 179 71 / .55), inset 0 0 0 2px #7a4a00; }

/* ---------- Telegram line ---------- */
.telegram { margin-top: 1rem; display: grid; grid-template-columns: auto 1fr auto; align-items: baseline; gap: .5rem 1.25rem; padding: 1rem 1.25rem; background: var(--paper); color: #2b2418; border-radius: 3px; box-shadow: 0 14px 30px -18px rgb(0 0 0 / .7); }
.tg-label { font: 700 .72rem var(--type); letter-spacing: .16em; text-transform: uppercase; color: #6b5a3d; }
.tg-text { font: 700 clamp(1.2rem, 3vw, 1.7rem)/1.3 var(--type); letter-spacing: .08em; min-height: 1.3em; overflow-wrap: anywhere; }
.caret { display: inline-block; width: .6em; height: 1.05em; vertical-align: -.15em; background: var(--ink); animation: blink 1.1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.tg-code { font: 700 1.3rem var(--type); color: var(--ink); letter-spacing: .12em; min-width: 5ch; text-align: right; }
@media (max-width: 36rem) { .telegram { grid-template-columns: 1fr auto; } .tg-label { grid-column: 1 / -1; } }

/* ---------- Desk: key + panel ---------- */
.desk { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr); gap: clamp(2rem, 6vw, 5rem); align-items: center; margin-top: clamp(2rem, 6vw, 4rem); }
.key-area { display: grid; justify-items: center; gap: .75rem; }
.key { width: min(100%, 30rem); padding: 0; border: 0; background: none; cursor: pointer; touch-action: none; -webkit-user-select: none; user-select: none; border-radius: 18px; }
.key svg { display: block; width: 100%; filter: drop-shadow(0 18px 20px rgb(0 0 0 / .45)); }
.key .lever { transform-origin: 63px 96px; transition: transform .05s ease-out; }
.key.down .lever { transform: rotate(3.2deg); }
.key-hint { color: var(--text-2); font-size: .9rem; }

.panel { display: grid; gap: 1.6rem; }
.field { display: grid; gap: .5rem; }
label { color: var(--text-2); font-size: .95rem; }
output { color: var(--text); font-weight: 800; font-variation-settings: "wdth" 130; }
input[type="range"] { width: 100%; accent-color: var(--brass); }
.send { display: grid; gap: .5rem; }
.send-row { display: flex; gap: .5rem; }
.send-row input {
  flex: 1; min-width: 0; font: 700 1rem var(--type); letter-spacing: .06em; text-transform: uppercase;
  color: #2b2418; background: var(--paper); border: 2px solid transparent; border-radius: 4px; padding: .65rem .8rem; min-height: 2.9rem;
}
.send-row input:focus { outline: none; border-color: var(--brass); }
.send-row input::placeholder { color: #8a7b5f; }
button { font: 700 1rem var(--display); cursor: pointer; }
#send-btn { background: var(--brass); color: #2a1d08; border: 0; border-radius: 4px; padding: 0 1.2rem; min-height: 2.9rem; font-variation-settings: "wdth" 120; transition: filter .15s, transform .1s; }
#send-btn:hover { filter: brightness(1.08); }
#send-btn:active { transform: translateY(1px); }
#send-btn:disabled { background: var(--desk-3); color: var(--text-2); cursor: progress; }
.err { color: var(--lamp); font-size: .9rem; min-height: 1.2em; }
.actions { display: flex; gap: .6rem; flex-wrap: wrap; }
.quiet { background: transparent; color: var(--text); border: 1px solid var(--line); border-radius: 999px; padding: .5rem 1rem; min-height: 2.6rem; font-weight: 500; transition: border-color .15s, background-color .15s; }
.quiet:hover { border-color: var(--text-2); background: var(--desk-3); }
@media (max-width: 52rem) { .desk { grid-template-columns: 1fr; } }

/* ---------- Chart ---------- */
.chart { margin-top: clamp(3.5rem, 8vw, 5.5rem); }
.chart h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); font-weight: 900; font-variation-settings: "wdth" 140; margin-bottom: 1.1rem; }
.codes { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(6.2rem, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); }
.codes li { display: flex; align-items: center; gap: .7rem; padding: .6rem .7rem; background: var(--desk); transition: background-color .6s var(--ease-out); }
.codes b { font: 700 1.1rem var(--type); width: 1.2ch; }
.sig { display: flex; align-items: center; gap: 3px; }
.sig i { display: block; height: 5px; border-radius: 3px; background: var(--text-2); }
.sig .d { width: 5px; } .sig .l { width: 15px; }
.codes li.hit { background: var(--brass); color: #2a1d08; transition-duration: 0s; }
.codes li.hit .sig i { background: #2a1d08; }

.foot { margin-top: 3rem; padding: 1.25rem 0 3rem; border-top: 1px solid var(--line); color: var(--text-2); font-size: .9rem; }
.foot p { max-width: 70ch; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  .caret { animation: none; }
}